To be totally frank i dont see why i should give him any kind of full or partial refund. The major downside is he knows where i live but im not prepared to be blackmailed into giving hima refund just because he knows where i live!
He is good friends with at least 1 well known member of passionford from the regional ford community (not going to name the friend as thats a bit unfair) so hes not totally exempt from being located himself, if he does try to play funny buggers.
I think he should just accept he's made a silly mistake by buying something he knows nothing about and sell it on... end of story!